static 기억부류를 갖는 대상체 초기화 질문입니다.

$ cat gl.c
#include <stdio.h>
 
int foo(void)
{
        return 8;
}
 
double arr1[3];
int a = (int)"Hello";
int b = (int)arr1;
int c = (int)&a;
int d = (int)&a + 1;
int (*p_foo)(void) = foo;
 
int e = b + 1;
int f = foo();
 
int main(void)
{
        /*
        static double arr2[3];
        static int i = (int)"World";
        static int j = (int)arr2;
        static int k = (int)&j;
        */
        printf("%d %d %d\n", a, b, c);
        return 0;
}
 
$ gcc -g -W -Wall -ansi -pedantic gl.c
gl.c:15:9: error: initializer element is not constant
 int e = b + 1;
         ^
gl.c:16:9: error: initializer element is not constant
 int f = foo();
         ^
$ gcc -g -W -Wall -std=c99 -pedantic gl.c
gl.c:15:9: error: initializer element is not constant
 int e = b + 1;
         ^
gl.c:16:9: error: initializer element is not constant
 int f = foo();
         ^
$ gcc -v
(...)
gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4)